Balanced cam shaft



A. E AUGUSTINE.

BALANCED CAM SHAFT. APPLICATION men NOV-18, 1919.

1 ,404, 1 83, Patented Jan. 24, 1922.

/Q H @j 2 m a n 8 Z Q Q UNITED. STATES PATENT OFFICE.

'AnnIsoN n. AUGUSTINE, or HAGKENSACKQ'NEW JERSEY, ASSIGNOR TO CHESTER. MACHINE 00. me, on NEW YORK, N. Y., A CORPORATION on NEW YORK To all whom it may concern Be it known that I, ADDISON E. Acous- TINE, residing at Hackensack, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvemerits in Balanced Uam Shafts, of which the following is a specification. I

, This invention relates to a balanced cam shaft. V

'In machines in which cams are employed for controlling the operation of different elements of the machine the cams almost necessarily produce a preponderance of weight at one side of the rotating axis of their carrying shaft and this weight naturally tends to gravitate to the lowest point, thus causing at times an operation'of one or more elements of the machine after the driving power has been cut off fromsaid shaft and the machine'is supposed to be at rest.

Also, certain of the levers, rollers, etc. which bear against and cooperate with the cams frequently induce rotation of the cam shaft to the same-undesirable result.

It is the object of this invention, therefore, to overcome this difficulty by'providing means whereby the cam shaft is at all times substantially balanced and no tendency is present for rotating the shaftexcept that purposely applied by the appropriate driving mechanism.

A further more detailed object is to provide the cam shaft with a cam and means cooperative therewith for counteracting in proportional power the tendency of the other cams and their cooperative the shaft.

Other objects and aims of the invention, more or less specific than those referred to above, will be in part obvious and in part pointed out in the course of'the following description of the elements, combinations, arrangements of parts and applications of principles, constituting the invention; and

parts to rotate the scope of protection contemplated will be indicated in the appended claims.

In the accompanying drawings which are to be taken as a-part ofthis specification, and in which'I have shown merely a preferred formof embodiment of the invention:

Figure 1 is a transverse sectional view through a cam shaft having cams thereon BALANCED 0AM SHAFT.

Specification of Letters Patent. Patent d J 24 1 Application filed November 18, 1919. Serial No. 338,815.

and cooperative features arranged in accordance with this invention, and

Figure 2' is a top plan view of the mechanism illustrated in Fig. 1.

Referring to the embodimentillustrated m detailin the drawings, the reference character L indicates the cam shaft and G indicates one of the usual cams which is fixed to the shaft in position for operating a .lever 1. The lever 1 may be pivotally mounted, as at 2, in any appropriate support as for instance the portion 3 of the frame work of the machine. This lever, as illustrated, includes an arm at carrying a rod 5 which extends to some foreign point for operating a given feature of the machine of which the, cam shaft forms an essential element. Other cams, as 6 and 7, may be fixed to the shaft L and these may also have levers, corresponding to the lever 1, or they may beprovided with other appropriate cooperatlve means, as will be readily understood for operating other features of the machine.

In 1*igure '1 a side view is given of the cam G and it will be seen that a roller 8 carried by the lever 1 rests against the surface 9 of the cam G in such manner that the pressure of the roller, under the tension of the spring 10, is exerted against the surface 9 of the cam in a manner tending to rotate the cam in the direction of the arrows in said figure. I

It will also be. seen that the preponderance of weight in the cam G is such as to lend force to the same tendency.

Mounted upon the shaft L is a cam H.. A lever 11 carries a roller 12 which bears upon the surface of the cam 11 under the pressure of a spring 13. The lever 11 may be pivotally mounted, as at 14, in a portion 15 of the main frame of the machine, and the contour of the surface of the cam H with which the roller 12 engages is such that the pressure of the roller against said surface produces a tendency to rotatethe cam in a direction opposite at all times to the direction in which the roller 8 tends to rotate the cam G and with a power which is preferably exactly proportional to the opposing power of the roller 8.

This result may, of course, be obtained in various ways, as by changing the contour or size of the cam H, or by utilizing a spring of greater or less power in the position of the I spring 13. The principle involved, how- 7 ever, is always the same; namely, of applying to the shaft a retardingforce which is at all times proportionalin power to the power of the roller, 8 and other unclesirable forces tending to rotate the shaft;

Of course it will be understood that the cam G and its lever 1 are simply illustrative of any number of cams and levers which may be assoclated with thecam shaft for operatlng the various elements of the 1118;-

chin'e. These various camsandlevers may be of difierent types and shapes but their resultant tendency to rotate the shaft is always the same in kind as isillustrated by the swinging arm- G and lever 1. Whatever thedegree of this tendency, thecam H and lever l l'a're intended to counteract in I proper proportional force so thatthe shaft will stand at rest in any position of rotation to which it may be moved by the machines construction without departing from the prescribed driving mechanism. y

, It should be notedthat incidentally the 25 presence of the ,cam H and'lever ll imposes substantially no additional work. to be performed by the normal "driving mechanism of the ,xnachine' but that they simply serve; to

make the work to be performed of a constant quantity "instead of as an everchanging quantity as heretofore.

It is further "to be noted thatthe' cam H may be so shaped and positioned as to place 7 'apreponderance of its own weight in such position relative to the rotating axis of the shaft L asfto counteract in'proportional degree the tendency ofthe shaft to rotate un-.

derthe influence ofthe cam or even under the "influence of said cam G and the lever 1.

As many changes could be made in this scope of the invention as defined in the following claims, it is int-endedthat all matter contained in the above description or shown in the accompanying drawings, shallbe interpreted as illustrativeonly and not in a limiting sense. 7

.I-Ia'ving thus described my invention, what 'I'claim as new and desire .toisecure by Let .tei's Patent is Y l. A cam shaft, a cam fixed thereto, and

:n eans to be operated by said cam, saidcam and said means bGlIlgCQOPGIzLiJlVG for tending to rotate said shaft undesirably, the

f combination" therewith of means to counteract. and balance said tendency,

A cam shaft, a cam'fixed thereto,

,meanstobe; operated by saidcain, said cam' and said means being' cooperative with a V varying degree of power tending to rotate I the shaft undesirably, the combination therewith of meansto counter-act said tendency V .with a pow rjvarying in proportionto said first. mentioned power. V v p cam shaft, a cam fixed thereto, and 7 means to be operated by said cam, said cam and said means being cooperative wlth a,

varying degree of powertending to rotate the shaft undesirably, the combination therewith of a second camfixedtosaid shaft and means cooperative therewith to counter-act said tendency with a power varying in proportion to said first mentioned power.

4. :A-cam shaft, a cam fixed.thereto,jand

means associated with said cam'tendingjto rotate said shaft undesirably, the combination'therewith of means to counter-act and balance said tendency. V v w 5. The combinationwith a cam shafthaving a plurality of cams fixed thereto of difshaftundesirably, of means at all times op-.

erating upon said shaft tobalance proportionallythe effectof said first mentioned means and thereby to counter-act said tendency. p 7. The combination with a cam shaft, a cam, fixed thereto, and a follower device pressing against said cam tending by its engagement witlithe relatively inclined surfaces of the cam to rotate. the cam undesirably, of means at all times operating upon said shaft to balance proportionally the effect of saidfollower device and'thereby to counter-act said tendency.

8. Thecombination with a camshaft, a

,cam fixed thereto, and a follower device en gaging said camofferinglvarying resistance to'th'e. rotation of said shaft according to the contour of; said cam, of means at all'times operating upon saidshaft-to balanceproportionally the effect of said follower device and V therebyto producela uniform resistance to the rotation of said shaft.

9. The combination with a" cam shaft, a cam fixed thereto, and a follower deviceen gaging said cam,-sa1d follower; device and said'camj cooperating to 'ofier varying resistance to the rotation of said shaft according to the contour ofsaid cam, of a further cam fixed to said shaft, and means engaging said further camat all times. cooperating there with tobalance proportionally the effect of" said first cam and said follower device and. 7

thereby "to produce a uniformresistance to the rotation of said shaft.

I In testimony whereof Iafiix" my signature 1n the presence of two witnesses.

anms'on nnuousrinia Witnesses; r

t L- GEssFORD HANDY,

' MA Y SoHULz. 

